On 14/09/20 08:06, Pavel Dovgalyuk wrote:
GDB remote protocol supports reverse debugging of the targets.
It includes 'reverse step' and 'reverse continue' operations.
The first one finds the previous step of the execution,
and the second one is intended to stop at the last breakpoint that
would happen when the program is executed normally.
Reverse debugging is possible in the replay mode, when at least
one snapshot was created at the record or replay phase.
QEMU can use these snapshots for travelling back in time with GDB.
I had queued this, it is a very nice patch series. Unfortunately, the
tests failed on gitlab:
https://gitlab.com/bonzini/qemu/-/jobs/745795080